has anyone heard of this on one of our trucks?

does anyone make a setup like that for us?

 

Rocking this from the grave!!

I've been looking around today, but nothing conclusive. I'm interested in doubling np203 to the stock 46re and nv231.

46re spline count is 23, so *check*. Bolt pattern is what though?

My searching techniques suckuth and would appreciate any input on this.

Thanks!

 

Not sure about much of your question, but don't forget to make sure the trans output is the same diameter as the female tcase input!

 

if they a doubler with a 231 or 241 for a chevy it should, keyword should, work with our tcases. internals are pretty much the same, with minor differnces if its manual or electrical shift and axle engaement. you would just have to figure out a way to get the drop on the drivers side

 

Bolt pattern they are talking about is where the t-case bolts to the transmission. Seems most of the 203 cases had an asymmetrical pattern. Not every hole was the same distance from its neighbors. You would have to have an adapter, or, as mentioned, redrill a couple holes.

The 203 was also a cast iron, full time 4x4 case. That sucker weighs a ton. Basically bulletproof though.....

Most folks do the double case to get the extremely low Lo range. (2.73 in the stock case, and something similar in the second case.... top speed of about three miles and hour, but, enough torque multiplication to pull the house of the foundation, if you don't snap axles like twigs first.) You would have to have custom driveshafts as well. (longer front, shorter rear.)

This is a mod mostly used by rock crawlers, that aren't blasting thru the obstacles at warp 5.

 

^HeyYou -- great elaboration.

OMG -- BackwooooooooooodsRam!! Good to see ya dude.

Some of my searching around has shown common use of np203/np205 doubler. Those for the Dodges are the 1st gen. I was trying to determine if the np203 1st gen will bolt right up to the 2nd gen. trans. I believe they will, but it can be flexible in terms of redrilling/clocking/etc. I've come across some threads here and there.

The next I came across as the next common doubler path is using the 231/205. I've seen kits priced $500, called box4rocks. This one seems to only be obtained direct from a person. Previously was selling thru ebay, but now can only find the username. Odd. There are some other options as well, something called a Klune-V underdrive. I'm still figuring that option out and have no idea on the price.

My thought, at this time for planning purposes, is to come up with the most economical path of a doubler that provides low range and keeps the DD aspect of my rig. This route is much more of a bang/buck relative to changing R&Ps. My plan is to remain stock ORE axles/trans/Tcase with the challenge maximizing their performance. Indeed the next weakest link would be axle shafts. However, that's not a bad thing to await their breakage, right?

I'll report what I come across as best I can. Quick search on CL for np203 and np205 showed price ranges from $150 to $300. My concern is getting versed with them such that I can identify their condition. So maybe my question here now would be, what should be asked about and looked at in person in assessing them?

Thanks

 

The Klune V under drive is going to run about $1500 and seams to get great reviews from people. You have another opt and thats to change the t case 2.72:1 low range gear set to 4.0:1 http://www.4x4wire.com/jeep/tech/xfer/tera4_1/

 

The over/underdrive units are cool..... and installation is a bit easier than doing the dual t-case, but, cost is prohibitive..... I have seen them run for over 1500 bucks.... and that doesn't include installation/custom driveshafts, etc...... Doing gears would be cheaper. Granted, either route (aux trans vs. added t-case) would require driveshaft modifications... For cost, I think one of the kits for a dual t-case would be better.....

I think the older t-case would need some work to bolt directly to the trans, (bolt pattern adjustment....) but, still, would end up cheaper than a dedicated aux trans.

If you want a lower low range.... there are 4:1 kits for the 231/241 dodge t-cases.... there are also lower 1st/2nd gear ratios available for the transmission.....

The older 203/205 cases were basically indestructible behind a stock engine. (or even a slightly warmed engine.) They are both cast iron, so, case failures were extremely rare. (and generally caused by a failure somewhere else... like, not keeping fluid in 'em.) If there is still fluid in it, make sure it is reasonably clean, and doesn't have metal filings in it. If everything turns smoothly, and it shifts nicely, it's prolly ok. Wouldn't hurt to open up whatever you buy, clean it out, and inspect it carefully on the bench.

203 was chain drive, with all the inherent problems you find with a chain. 205 was purely gear driven. A MUCH stouter case.

I was considering looking an the NP242 case...... it offers an additional range: Differentiated 4x4, so you have a 4x4 range that drives all four tires, but, still allows differentiation for things like cornering, and for use on dry pavement. Not sure if it is as strong as the 241DHD I have now though.... putting in weaker parts just doesn't strike me as a good idea.

 

[quote=Wh1t3NuKle;2668228]^
The next I came across as the next common doubler path is using the 231/205. I've seen kits priced $500, called box4rocks. This one seems to only be obtained direct from a person. Previously was selling thru ebay, but now can only find the username.



Here is the contact info for those Box4rocks kits. I did have a quick chat with him and he does have kits, as I am not into this conversion I did not chat for too long. Give him a call and LEAVE a Message he will get back in touch with you, he’s a busy man in a machine shop. Very helpful guy. This is not a store front it a machine shop that makes these kits in house.

Duffy
D.D.Machine
(360)649-4465 cell
(360) 779-2500 shop or home

 

Nice find, but is the kit the $1300ish one?

http://www.teraflex.biz/products/low-range

I've been slapped for reading too simple at times.

Thanks for also calling on that box4rocks. I'm hoping to find reviews on that thing of some degree.


HeyYou -- thank for the extra input! How far did you get with the 242 idea? What was the configuration scheme?